Mold Concerns
| Hang-Up Spots |
Most hot-runner systems are naturally balanced and provide an equal flow distance to each hot-runner gate. As the hot-runner channels branch off to form secondary or tertiary channels, the channel diameters can become smaller to accommodate the corresponding drop in material throughput.
The process of drilling flow channels can produce dead spaces where material can stagnate and degrade. Degraded material can then reenter the melt stream and show up in finished parts as splay, burned streaks or black specs. Plug and streamline the flow in these areas to prevent locations where the material can hang up and become degraded. Dead spaces can also occur at gaps between poorly fitting components and at unblended transitions in the flow channel.
